First, the system structure composition
1.1 Overview
Vehicle positioning monitoring system is based on GPRS/CDMA wireless communication, GPS (Global Positioning System), GIS (Geographic Information System), Internet technology and database programming technology developed for the vehicle positioning monitoring system, users can pass the system in the first For a time, the vehicle's location, operating status, and even information such as license plates, models, affiliated units, drivers and passengers, maintenance, etc., can also be used to view the historical usage of the vehicle, its operation trajectory, and statistical management. The emergence of this system can provide users with informational basis for management and decision-making, and provide scientific and accurate management.
Vehicle positioning monitoring system consists of GPS vehicle information management software, client software and vehicle terminal hardware, and network equipment that can be connected to INTERNET. The system can implement all-weather dynamic monitoring, positioning, tracking, dispatching command, and real-time implementation for various mobile users. Accurate, fast and effective intelligent management has been widely used in various sectors of modern society.
GPS vehicle information management software is a hybrid architecture of B/C (browser and server architecture) and C/S (client and server architecture). The system management software supports various communication and data interaction methods such as wireless network (GPPS/CDMA) and DDN dedicated lines.
The system vehicle positioning terminal hardware is responsible for the collection of GPS positioning data and sends the data to the central server through the wireless GPRS network.
At the same time, the system needs the support of INTERNET network, relying on the Internet to be able to achieve positioning data collection, management and release work.
To sum up, the system is composed of data server software and client software, vehicle positioning terminal and internet.
1.1 Construction Principles
Timeliness
The system requires information to respond quickly. The command control completes the transmission and processing of the information in almost negligible time within 2 seconds.
stability
The system requires 24 hours a day, 365 days a year without shutdown operations, large data transfer, fast response, hardware and software processing capabilities must ensure this demand.
Practicality
The operation of the entire system is based on convenience, simplicity, and efficiency. The overall design of the multi-operation platform is unified. It not only fully reflects the characteristics of rapid response, but also facilitates the staff's business processing and comprehensive management. It is convenient for the leadership and management to understand each item in time. Statistics and decision information.
Advancement
The system adopts sophisticated high-tech technologies and implements the required functions in the current more advanced methods. It not only reflects the advanced level of today's science and technology, but also has the potential for development to ensure that the system will not be eliminated in a relatively long period of time.
Scalability
The system is required to have the ability to expand and upgrade in terms of structure, capacity, communication and processing capabilities.
reliability
The system must be continuously operated with high reliability. The design is within the allowable scope of economic conditions. It should be comprehensively considered from the aspects of the system structure, design scheme and technical support to make the system stable and reliable. On the other hand, the system should adopt mature technology and commercialization as much as possible. The hardware and software products are also the guarantee for reliable and stable operation of the system. The system has a strong ability of fault tolerance and provides backup capability for important data to ensure high system reliability.
Economical
The center's equipment uses products with high cost performance as much as possible.
compatibility
The system supports compatibility with a wide range of system software and databases.
Second, the functional description of each component
2.1 Data Server Software Features
GPS vehicle information management software provides users with functions such as data storage and retrieval based on IP interconnection technology, adopts SQL SERVER database, supports ORICLE and SYBASE databases at the same time; modular design, modularizes logic functions of the general center, and controls internal data flow. It has been optimized to be able to flexibly construct large-capacity systems and small-to-medium-scale data systems. Make the whole system have powerful expansion capacity, and the function expansion architecture has the ability of flexible reorganization.
The B/C structure of the GPS vehicle information management system supports the WEB browsing function. Users log in to the server management monitoring system through browser software such as IE, and use the user name and password in advance to log in for vehicle editing, management, and maintenance.
The GPS vehicle information management system includes system management, vehicle management, and parameter maintenance functions. It can provide users with support for vehicle grouping, permission setting, vehicle information editing, and network data maintenance, etc. Rights management is simple, convenient, and clear.
The GPS vehicle information management system provides hierarchical account management, including system administrators, company administrators, department administrators, and fleet managers. Record detailed customer information separately, with clear permissions. All managers, including operators, want to have their own account. Each account is unique in the system; it can be added, modified, and deleted. Each account is assigned different permissions. Permission management includes:
â—† Permission to operate: Set whether an account can perform some operations, such as calling a vehicle, setting an alarm, and specifying account permissions.
â—† The authority to manage vehicles: Set the accounts with the current account permissions or add subordinate vehicles in this group of accounts.
â—† Data Management Rights: You can set a certain or group of accounts to view the data in the management system.
2.2 Client Software Features
The client can perform real-time position tracking, vehicle speed limit alarm, zone alarm function setting, alarm query and clear, yaw alarm, status monitoring, history trajectory playback, data transmission cycle adjustment, alarm statistics and other functions for the specified vehicle.
Other functions: GIS map editing, map zooming function, area measurement, distance measurement, vehicle display and shielding, and displaying vehicle basic information.
â—Real-time position tracking
The vehicle terminal transmits real-time GPS positioning data back to the data center server, and the positioning data includes longitude, latitude, speed, direction, and the like;
Users can log in to the central server through the client software to monitor the position and trajectory of the vehicle in real time on the client GIS map.
â— Vehicle speed limit alarm
Speeding alarm: When the vehicle exceeds the predetermined maximum speed, it will automatically return alarm information.
Segmented speed limit alarm: Different speed limit alarm values ​​can be set according to different road sections, and different speeds can be defined for different sections of a road.
â— Regional alarm function settings
Regional alarms include incoming alarm, outgoing alarm, and regional speed limit alarm.
Into the alarm: When the vehicle enters the restricted area, the terminal will automatically return the alarm information and give the alarm position.
Outgoing alarm: When the vehicle drives out of a limited area, the terminal automatically returns the alarm information and gives the alarm position.
Regional speed limit alarm: When the vehicle enters the zone where speed is limited, the terminal will send back the alarm information and give the alarm position when the speed exceeds the limit within the zone.
â— Alarm query and clear
The system software can send an alarm query instruction to the designated vehicle terminal. The terminal that receives the alarm query will send back all the alarm setting type information to the client; at the same time, the client software can clear a certain type of alarm or all of the specified vehicle.
â— Power off alarm
When a person cuts off the external power supply of the onboard unit or accidentally causes damage to the onboard power supply, the onboard unit will automatically return the power off alarm message to the center.
â— Yaw alarm
The user can set the driving route for the designated vehicle. If the deviation from the route system is within the limited course, it will automatically alarm.
â— Status monitoring
The system can regularly monitor some of the vehicle's working status, such as emergency assistance, event triggering, vehicle shutdown, power failure alarm.
â— Historical track playback
The system supports trajectory playback, which can save the tracks of all vehicles. The trajectory playback can be fast forwarded, played back, paused, etc., and information such as the time of playback position is displayed. The map is automatically adjusted to move with the vehicle, and the trajectory is displayed in points and lines to support the vehicle. Run track print function. You can save the vehicle's operating route, operating area, and place of arrival, and record it in the database for future inquiry and analysis.
â— Data transmission cycle adjustment
The positioning data sending cycle can be adjusted at any time. When the vehicle is stationary, the GPS positioning data sending interval can be automatically increased to reduce communication costs.
â— Alarm statistics
The system can perform statistics and printing on the designated vehicle according to the type of alarm, which is convenient for the user to manage the vehicle.
â—Other functions
GIS map editing, map zoom function, area measurement, distance measurement, vehicle display and shielding, and display of vehicle basic information.
The map adopts advanced electronic vector maps, users can edit and adjust the features on the map, and control the features and layers of the objects they care about; the map display window can zoom in and zoom out, and turn on and off the same attributes. Landmark names, etc.; map display supports auto-tuning, so that the monitored vehicle is completely in the best visual field of view. When the vehicle comes out of the map, it can automatically adjust the map, the monitored vehicle is located in the center of the map.
On the GIS map, area measurement and distance measurement can be performed. Vehicles in the area can be shielded and displayed. Vehicles and their basic information of the designated vehicle group can be selected and displayed.
2.3 Vehicle Positioning Terminal Function
A. Always online, connect to the server automatically;
B. Support fixed IP and domain name dynamic connection;
C. Real-time GPS positioning data acquisition;
D.GPRS wireless data communication;
E. Perform oil cut off and power off control;
F. trigger alarm (anti-robbery) detection;
G. Central Information Display;
H. Power supply over-current protection, self-recovery function;
I.TCP/UDP communication;
The on-vehicle positioning terminal is a necessary equipment for GPS positioning data acquisition installed on the vehicle. It can use a variety of power supplies on various vehicles, and it can be adapted to the requirements of vehicle installation to the greatest extent. It has the characteristics of short on-line time and high positioning accuracy.
Third, hardware related technical parameters
â—† Power supply
Wide power input, external DC power supply DC 9-36V;
Suitable for a variety of vehicle installations, built-in lithium battery power supply;
â—† Power consumption
Maximum operating current 1.2A, average power consumption is less than 5W;
â—† Dimensions
105×80×28mm;
With a metal shell, the shell has the strength of shock and drop;
â—† Working temperature
Working environment temperature: -35 °C ~ 65 °C;
Storage temperature: -45°C ~ 85°C;
â—† GPRS parameters
GPRS vehicle antenna sucker,
Working frequency 900~1800Mhz;
Interface SMA female;
â—† GPS parameters
3~5 volt GPS sucker antenna;